Fluid fuel burner



Sept. 17, 1935. w w, wlLLlAMs Er AL 2,015,048'

FLUID FUEL'BURNER Original Filed Dec. 27, 1932 l Patentedisept. 17, 1935 'UNITED STATES PATENT OFFICE FLUID FUEL BURNER Walter W. Williams, Philip A. Celander, and Oliver Earl Nesmith, Bloomington, Ill.; said -Celander and said Nesmith assignors to Williams Oil-O-Matic Heating Corporation, Bloomington, Ill., a corporation of Illinois Original application December 27, 1932, Serial No.

Divided and this application October 4, 1933, Serial No. 692,096

. 1 Claim.

the fluid fuel discharging means, and provide a simple and positive control for the supply of fluid fuel operated by the actuation of the burner mechanism. 1

With these and other objects in view, reference is made to the accompanying sheet of drawings which illustrates a preferred form of this invention with the understanding that Vminor detail changes may be made therein without departing from the scope thereof.

In the drawing:

Figure 1 is a. View in side elevation of a commercial type of domestic uid fuel burner with parts broken away, illustrating the, draft pipe, nozzle, a portion of the fan housing, and a fuel discharge chamber in section.

Figure 2 is a fragmentary enlarged detail view of the fuel discharge chamber including the mounting of the .oil pipe. .l

Figure 3 is an enlarged detail view partly in section and partly in elevation of the nozzle and attached fuel andair delivery pipes as illustrated in Figure 2.

Figure 4 is a View intransverse section taken on the lines 4-4 of Figure 3 looking in the direction of the arrows.

In the embodiment of this invention as illustrated, the basel supports an integral fan blower casing or housing 2-having an extension for receiving and mounting an electric motor, not shown.` The motor is provided with a driving shaft for operating an oil pump 3 and also op erating a fan blower. The driving shaft is eX- tended through the opposite side of the motor for operating a compression pump and metering pump'mounted, not shown. The general construction and operation of the pressure pump and metering pump is of the type disclosed in the W. W. Williams Patent No. 1,451,798, granted April 17, 1923.

Mounted upon the base I and extending from the fan housing 2 a draft pipe 4 is provided. Fuel is delivered through the pipe 5 centrally mounted within the draft pipe and terminating in a nozzle 6 adjacent the open'end of the draft pipe 4 and continuing in the opposite direction through It is an object of this invention to reduce the noise of operation, improvel the construction of (Cl. 15S-36.5)

the lower part of the housing and communicating with a float chamber l which in turn communicates by the pipe 8. with the pressure pump. This construction in general is disclosed in W. W. Williams prior Patent No. 1,831,277, granted November 10, 1931, upon a iiuid fuel burner construction. The pipe 5 supports electrodes 9 terminating a short distance in advance of nozzle 6.

When the motor is operating, air is drawn in through the muilier and intake to the pressure pump and at the same time oil is metered into the intake of the pressure pumpthrough the me- 4tering pump and both air and oil under pressure are delivered from the pressure pump through the pipe 8 to the float valve casing 'I, as shown in Figure 1.

The float valve casing 'I is shown in detail in.

Figure 1. As heretofore stated, fuel is delivered from the oat valve casing 1 through the pipe'l and is discharged at the open end of the draft .pipe 4 through the nozzle 6. As shown in Figure NO. 1,831,277,dated Novembe` 10, 1931, the air and oil entering the oat valve casing I separate and, as the level of the oil rises, it causes the iioat I0 to ascend and uncover a. port, not

shown, in the pipe II threaded into the block I2, which also mounts the pivot I3 of the oat valve. An oil pipe I4 of less diameter than the pipe 5 is screw-threaded into the block I2 and communicates With the pipe II. The oil pipe I4 mounts at the free end what is termed an air spiral, which includes a square casing I5 with beveled corners, adapted to be snugly received within acenter cylindrical bore I6 of the nozzle 6, as shown in Figures 3 and 4,. The oil pipe I4 is arranged concentrically Within the pipe 5, so that if the float I0 uncovers the 'port in the pipe` II, the pressure of the air above the ievel of the oil Will force the oil through pipes II and I4 and at the same time air is delivered through the space between the interior of the pipe 5 andexterior of the pipe I4 to the nozzle. The air spiral or air passages I8. The transverse end wall of the square casing I5 is provided with a conical projection/2I, which is concentric with the axis of the ,casing I5 and discharge orifice I1 with the apex terminating flush with the nozzle discharge orifice, so that the sides of the cone are spaced apart and are substantially parallel to the portion of the nozzle closure tapering away from the rozzle orifice I1. The nozzle 6 is provided with' .a screw threaded connection upon the pipe 5.

The block I2 is mounted upon a pin 22 carried upon that part o f the blower housing 2 which forms an end closure for the float valve casing 1. This portion of the blower housing is extended below the pin 22 and is` provided with a recess 2! through which the oil pipe I4 passes. The oil pipe I4 is provided with an adjustable shoulder or stop 24 and a coil spring 25 is placed about the oil pipe I4 with one end received within the -recess 23 and the other end in engagement with the shoulder 24. The shoulder 24 is so adjusted ,that the coil spring 25 exerts a continuous pressure upon the oil pipe in the direction of the nozzle, whereby not only is the block I2 held in position on the pin 22 but the square housing .I5 is always held against the closure of the nozzle i. i

` This construction not only obviates the necessity of a stuffing box or packing gland between the lpipe II and the oil pipe I4, as was necessary in the construction disclosed in the applicants, Walter W. Williams Patent No. 1,831,277, but

also provides a structure'in which no leak can occur. The air spiral or square casing Il makes with the conical projection 2I directly in the l center of the discharged orifice I1 of the nozzle. It has been found that it is almost impossible to exactly center the apex of such a conical projection upon an air spiral when the air spiral is screw-threaded into the nozzle, as disclosed lo in the said prior copending application No. 540,- 416, and in the improved construction illustrated in this application, the continual heating, and cooling of the outside shell of the nozzle l, causing contraction and expansion. does not change l5 the relation of the conical projection 2l to the discharge orifice I1, as such movement is compensated for by the coil spring 25.

What we claim is:

Means for mounting one end of a fuel pipe in zo a fluid fuel burner mechanism having a burner nozzle having a central discharge opening and a pump for delivering fuel and air through said nozzle, including a float chamber receiving the fueland air under pressure before it is delivered 25 to the nozzle, an air pipe leading from the chamber to the nozzle, and a fuel pipe leading from the chamber passing centrally through said air pipe mounting a fuel spiral forming one end of the fuel pipe freely slidable axially within the 30 nozzle, a perforated bracket provided upon the interior of the chamber slidably supporting the other end ofthe fuel pipe, a block carried on the end of the fuel pipe supporting an angular extension of the fuel pipe, a pin extending from :5 said bracket slidably supporting said block, an abutment upon the fuel pipe, and a spring about said fuel pipe betweensaid abutment and said bracket to maintain the fuel spiral in contact vwith the nozzle and the block in position upon 4;.;

its pin.

WALTER W. WILLIAMS. PHILIP A. CELANDER. OLIVER EARL NESMITH. 

